Tub enclosure



FIG. 1 is a perspective view of the tub enclosure showing our new design;

FIG. 2 is a front perspective view thereof; and,

FIG. 3 is a top plan view thereof.

The broken lines showing of the tub and drain hole are for illustrative purposes only and forms no part of the claimed design. 

An ornamental design for a tub enclosure, as shown and described. 